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drm/i915: Disable waitboosting for a saturated engine 

If the user floods the GPU with so many requests that the engine stalls
waiting for free space, don't automatically promote the GPU to maximum
frequencies. If the GPU really is saturated with work, it will migrate
to high clocks by itself, otherwise it is merely a user flooding us with
busy-work.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1470293567-10811-20-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-08-04 07:52:39 +01:00
parent 7da844c5c6
commit 37db14700e
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -2299,7 +2299,7 @@ static int wait_for_space(struct drm_i915_gem_request *req, int bytes)
if (WARN_ON(&target->ring_link == &ring->request_list))
return -ENOSPC;
ret = __i915_wait_request(target, true, NULL, NULL);
ret = __i915_wait_request(target, true, NULL, NO_WAITBOOST);
if (ret)
return ret;